CommaFeed 4.4.0

• add support for sharing using the browser native capabilities if available (#1255)
• add a button in the entry headers to star an entry (#1025)
• add a button in the entry headers to open links in a new tab (#1333)
• add two options in the settings to toggle those buttons
• accept .opml file extension when importing and export with the .opml extension
• the "mark as read" option is no longer shown in the context menu for entries that are too old to be marked as read (older than keepStatusDays) (#1303)